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Lyapunov-Kozlov method for singular cases

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Abstract

Lyapunov’s first method, extended by Kozlov to nonlinear mechanical systems, is applied to study the instability of the equilibrium position of a mechanical system moving in the field of conservative and dissipative forces. The cases with a tensor of inertia or a matrix of coefficients of the Rayleigh dissipative function are analyzed singularly in the equilibrium position. This fact renders the impossible application of Lyapunov’s approach in the analysis of the stability because, in the equilibrium position, the conditions of the existence and uniqueness of the solutions to the differential equations of motion are not fulfilled. It is shown that Kozlov’s generalization of Lyapunov’s first method can also be applied in the mentioned cases on the conditions that, besides the known algebraic expression, more are fulfilled. Three theorems on the instability of the equilibrium position are formulated. The results are illustrated by an example.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade, 11000, Serbia

    V. Čović, D. Djurić & A. Obradović

  2. Faculty of Mechanical Engineering, University of Kragujevac, Dositejeva 19, Kraljevo, 36000, Serbia

    M. Vesković

Authors
  1. V. Čović
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  2. D. Djurić
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  3. M. Vesković
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  4. A. Obradović
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Corresponding author

Correspondence to V. Čović.

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Project supported by the Ministry of Science and Technological Development of the Republic of Serbia (Nos.ON174004, ON174016, and TR335006)

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Čović, V., Djurić, D., Vesković, M. et al. Lyapunov-Kozlov method for singular cases. Appl. Math. Mech.-Engl. Ed. 32, 1207–1220 (2011). https://doi.org/10.1007/s10483-011-1494-6

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  • DOI: https://doi.org/10.1007/s10483-011-1494-6

Key words

Chinese Library Classification

2010 Mathematics Subject Classification

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